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- W2912285952 abstract "The recently developed stochastic gradient method combined with Monte Carlo sampling techniques [PRB {bf 95}, 195154 (2017)] offers a low scaling and accurate method to optimize the projected entangled pair states (PEPS). We extended this method to the fermionic PEPS (fPEPS). To simplify the implementation, we introduce a fermi arrow notation to specify the order of the fermion operators in the virtual entangled EPR pairs. By defining some local operation rules associated with the fermi arrows, one can implement fPEPS algorithms very similar to that of standard PEPS. We benchmark the method for the interacting spinless fermion models, and the t-J models. The numerical calculations show that the gradient optimization greatly improves the results of simple update method. Furthermore, much larger virtual bond dimensions ($D$) and truncation dimensions ($D_c$) than those of boson and spin systems are necessary to converge the results. The method therefore offer a powerful tool to simulate fermion systems because it has much lower scaling than the direct contraction methods." @default.
- W2912285952 created "2019-02-21" @default.
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- W2912285952 date "2019-05-30" @default.
- W2912285952 modified "2023-10-13" @default.
- W2912285952 title "Gradient optimization of fermionic projected entangled pair states on directed lattices" @default.
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- W2912285952 doi "https://doi.org/10.1103/physrevb.99.195153" @default.
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